Be quick to pen a word of encouragement (6)

I believe the answer is:

hurray

I'm a little stuck... Click here to teach me more about this clue!

'word of encouragement' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'be quick to pen a' is the wordplay.
'be quick' becomes 'hurry' (I've seen this before).
'to pen' is an insertion indicator.
'hurry' enclosing 'a' is 'HURRAY'.

Can you help me to learn more?

(Other definitions for hurray that I've seen before include "Yippee!" , "cheer" , "very brief message of joy" .)

I've seen this clue in The Telegraph.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.